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Analog Devices Inc. LT8601EUJ#PBF
- Part No.:
- LT8601EUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LT8601EUJ#PBF.pdf
- Description:
- IC REG BUCK ADJ TRPL 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:560
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Product details
Overview
LT8601EUJ#PBF from Analog Devices is a triple-channel monolithic synchronous step-down regulator with programmable power-on reset, supporting 3.0–42V (HV) and 2.6–5.5V (LV) inputs. It delivers up to 1.5A (OUT1), 2.5A (OUT2), and 1.8A (OUT3) with peak efficiency of 93% (HV) and 95% (LV), operating at 250kHz–2.2MHz. Used in automotive power systems stepping 12V/24V down to 5V/3.3V/1.8V.
For engineers reviewing the LT8601EUJ#PBF datasheet, LT8601EUJ#PBF pinout, LT8601EUJ#PBF application, or LT8601EUJ#PBF equivalent, key selection criteria include channel-specific input voltage ranges, independent PVIN pins, 2-phase clocking for reduced input ripple, Burst Mode quiescent current (30µA), and AEC-Q100 qualification for automotive use.
Technical Context
The LT8601EUJ#PBF integrates two high-voltage synchronous buck regulators (PVIN1/PVIN2, 3–42V) and one low-voltage synchronous buck regulator (PVIN3, 2.6–5.5V), each with cycle-by-cycle current limiting and independent feedback references (1.0V for HV channels, 0.8V for LV channel). All three channels share a single oscillator with 2-phase timing: CLK1 drives OUT1, while CLK2 (180° out-of-phase) drives OUT2 and OUT3.
It supports multiple light-load modes: low-ripple Burst Mode (30µA IQ) and pulse-skipping, selected via SYNC pin logic level. Power sequencing is enabled by RUN3 (0.72V threshold) and TRKSS1/TRKSS2 tracking inputs, while programmable POR uses CPOR capacitor (35.2ms typical delay) and POREN enable logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (HV) | 3.0V to 42V - supports automotive transients up to 42V on PVIN1/PVIN2 |
| Input Voltage Range (LV) | 2.6V to 5.5V - enables direct sourcing from HV outputs (e.g., 3.3V or 5V rails) |
| Output Currents | 1.5A (OUT1), 2.5A (OUT2), 1.8A (OUT3) - defined by internal switch RDS(ON) and thermal design |
| Switching Frequency | 250kHz to 2.2MHz - set by RT resistor; enables trade-off between component size and efficiency |
| Quiescent Current | 30µA (all channels active, no load) - enables always-on subsystems in automotive infotainment |
| Efficiency | Up to 93% (HV), 95% (LV) - achieved via synchronous rectification and optimized gate drive |
| Power-On Reset | Programmable via CPOR capacitor (31–39.4ms typ) - ensures deterministic system boot sequence |
Pinout & Package
The LT8601EUJ#PBF is housed in a thermally enhanced 40-lead 6mm × 6mm QFN package with exposed pad (Pin 41) soldered to PCB ground for optimal thermal performance (θJA = 33°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PG1, PG2, PG3 | Open-drain power-good indicators | Assert low when corresponding FB voltage deviates >8% from reference (0.92–1.08V for HV, 0.736–0.864V for LV) |
| PVIN1, PVIN2, PVIN3 | Independent input supply pins | Enable flexible power tree design: PVIN1/PVIN2 accept 3–42V; PVIN3 accepts 2.6–5.5V (e.g., sourced from OUT1/OUT2) |
| TRKSS1, TRKSS2 | Track/soft-start control inputs | Allow output voltage ramping and sequencing; regulate FB to TRKSS voltage when <1V (2.4µA pull-up) |
| RUN3 | Enable input for LV channel | Activates OUT3 when voltage exceeds 0.72V (typ); supports precise power sequencing |
| CPOR, POREN, RST | Power-on reset timing and control | CPOR sets POR delay (35.2ms typ with 1nF); POREN enables timer; RST is open-drain reset output |
| SYNC | Mode select and clock sync input | GND = Burst Mode; INTVCC = pulse-skip; external clock = synchronized operation (0.25–2.2MHz) |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent buck regulation | Two 42V HV channels + one 5.5V LV channel with separate PVIN, FB, and PG pins - enables compact multi-rail power architecture |
| 2-phase interleaved clocking | CLK1 (OUT1) and CLK2 (OUT2/OUT3, 180° out-of-phase) - reduces input ripple current and cuts required input capacitance by ~50% |
| Low-ripple Burst Mode | 30µA quiescent current with <15mV output ripple - maintains EMI compliance and signal integrity in standby mode |
| AEC-Q100 qualified | Rated for –40°C to 125°C junction temperature (E-grade) - validated for automotive body electronics and ADAS subsystems |
| Programmable power-on reset | Adjustable POR delay (31–39.4ms) via external CPOR capacitor - ensures reliable microcontroller boot timing |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Providing stable 5V, 3.3V, and 1.8V rails from 12V/24V battery in head unit or display controller. IC Role / Device Role / Timing Role: Triple-output synchronous buck regulator with 2-phase clocking and AEC-Q100 qualification. Use Value: Eliminates need for three discrete DC/DC converters; reduces board area by 40% and input capacitor count by half vs. single-phase solutions. | Use Scenario: Powering FPGA core, I/O banks, and communication interfaces (RS-485, CAN) in modular automation controllers. IC Role / Device Role / Timing Role: Multi-rail PMIC with independent enable/control per channel and programmable sequencing. Use Value: Enables precise power-up order (e.g., 1.8V before 3.3V) via TRKSS/RUN3, preventing FPGA configuration faults. |
| Distributed Telecom Power System | Medical Diagnostic Imaging Subsystem |
Use Scenario: Generating isolated 3.3V and 1.2V supplies from intermediate 5V/12V bus in base station radio units. IC Role / Device Role / Timing Role: High-efficiency (95% LV channel) synchronous buck with low-noise Burst Mode operation. Use Value: Maintains <15mV output ripple at light load - critical for ADC reference stability and RF front-end SNR. | Use Scenario: Powering low-noise analog front-end (AFE), digital signal processor (DSP), and display interface in portable ultrasound devices. IC Role / Device Role / Timing Role: Triple-output regulator with ultra-low quiescent current (30µA) and programmable POR. Use Value: Extends battery life in standby mode; POR ensures deterministic boot after cold start or brownout recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3375EFE#PBF | Octal 1A buck (configurable as 3-output), 3–20V input, no HV capability beyond 20V | Better suited for low-voltage distributed systems (e.g., server point-of-load); lacks 42V transient tolerance | Select when board space allows higher pin count and input voltage stays ≤20V |
| TPS6521905RGER | Triple buck (2x 3A + 1x 2A), 2.7–5.5V input only, no HV channels | Optimized for USB-C PD and portable electronics; no automotive qualification or 42V support | Select for cost-sensitive consumer applications where 42V operation is unnecessary |
Compared with LTC3375EFE#PBF and TPS6521905RGER, the LT8601EUJ#PBF uniquely combines 42V HV capability, AEC-Q100 qualification, and integrated 2-phase clocking-making it the only option for automotive multi-rail designs requiring transient robustness and EMI-controlled Burst Mode operation.
Availability
LT8601EUJ#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC modules, telecom radio units, and medical imaging subsystems requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LT8601EUJ#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LT8601EUJ#PBF belongs to the Power by Linear™ family of high-efficiency monolithic DC/DC regulators, designed specifically for demanding automotive and industrial applications requiring wide input range, low EMI, and robust power sequencing.
FAQ
What is the maximum input voltage rating for the HV channels of the LT8601EUJ#PBF?
The LT8601EUJ#PBF HV channels (OUT1 and OUT2) support an absolute maximum input voltage of 42V on PVIN1 and PVIN2, with recommended operating range of 3.0V to 42V. This rating accommodates automotive load-dump transients per ISO 7637-2, making the LT8601EUJ#PBF suitable for 12V and 24V vehicle electrical systems.
How does the 2-phase clocking in the LT8601EUJ#PBF reduce input ripple current?
The LT8601EUJ#PBF uses a 2-phase clock where OUT1 operates on CLK1 and OUT2/OUT3 operate on CLK2 (180° out-of-phase). Because buck regulators draw input current only during top-FET conduction, interleaving halves the peak-to-peak input ripple frequency and amplitude. This allows reduction of total input capacitance by up to 50% compared to single-phase operation - a key benefit in space-constrained automotive layouts.
Can the LT8601EUJ#PBF be used without external compensation components?
No, the LT8601EUJ#PBF requires external RC compensation networks on each FB pin (FB1, FB2, FB3) for loop stability. The datasheet provides standard Type II compensation guidelines and recommends R2 ≤ 200kΩ to minimize noise susceptibility. Omitting compensation risks instability, overshoot, or oscillation - especially under dynamic load steps common in FPGA or processor applications.
What is the purpose of the RUN3 pin on the LT8601EUJ#PBF, and what voltage threshold activates it?
The RUN3 pin on the LT8601EUJ#PBF enables precise power sequencing for the low-voltage channel (OUT3). It activates OUT3 when the applied voltage exceeds 0.72V (typical, with ±25mV tolerance over temperature). This allows OUT3 to be held off until upstream HV rails (e.g., 3.3V from OUT2) are fully regulated - preventing latch-up or improper initialization in complex SoC or FPGA power trees.
Is the LT8601EUJ#PBF pin-compatible with other members of the LT8601 family, such as the LT8601IUJ#PBF?
Yes, the LT8601EUJ#PBF is pin-compatible with all variants in the LT8601 family (including LT8601IUJ#PBF and LT8601JUJ#PBF), sharing identical 40-lead 6mm × 6mm QFN packaging and pinout. The only differences are operating temperature grade (E-grade: –40°C to 125°C) and minor parametric shifts in feedback voltage tolerances and switching frequency limits - all within datasheet-specified ranges for drop-in replacement in most designs.
LT8601EUJ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V, 1V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 1.5A, 1.8A, 2.5A
- Frequency - Switching:
- 250kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LT8601EUJ#PBF FAQ
1.How can I place an order for LT8601EUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8601EUJ#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8601EUJ#PBF reliable?
The price and inventory of LT8601EUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8601EUJ#PBF is usually 5 days.
3.What payment methods are accepted for LT8601EUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8601EUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8601EUJ#PBF?
LT8601EUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8601EUJ#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8601EUJ#PBF?
For technical support, including LT8601EUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8601EUJ#PBF requirements.
6.How does Aetrix verify that LT8601EUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LT8601EUJ#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8601EUJ#PBF meets industry standards.
7.What is the process for return or replacement of LT8601EUJ#PBF?
All LT8601EUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8601EUJ#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8601EUJ#PBF part is unused and in its original packaging.
Return procedure for LT8601EUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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